How do i add detail when sculpting?
Dyntopo (adaptive sculpting) is the option to use to add detail without being constrained by the underlying mesh topology. As I can see from your screenshot, you are already using it.

Be aware of the Dyntopo option: "Relative detail". It makes the stroke detail dependent on the zoom level: «Zoom out big details, zoom in small fine details». So... just try zooming in! 

There are other possible options, that you might find more suitable for you. For instance, "Brush detail": «You can increase and lower topology by simply resizing the brush itself».

Have a look at the manual for details about all the Adaptive Sculpting options: link to the manual.